Lever Experiment Worksheet

Science experiments lesson 24: Lever with a ruler and coins · Set 472 · 40 questions

What you do (Coins × distance): 1. Balance the ruler on the pencil at its 15 cm mark. 2. Put coins at a measured distance on the left side. 3. Place coins on the right and slide them until the ruler balances. 4. Check: coins × distance on the left = coins × distance on the right; press gently.

1. 1.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: where the pencil is is kept the same. (a) True (b) False
2. 2.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) turmeric powder (c) a flat table (d) a 30 cm ruler
3. 3.🧺 Do we need a 30 cm ruler for the ruler lever? (a) not needed (b) needed
4. 4.⚖️ A ruler balances on a pencil at its middle. You place 4 coins 2 cm to the left of the pencil. How many coins must you place 8 cm to the right to balance it?
5. 5.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is the one thing we change? (a) distance from the pencil (b) where the pencil is (c) the kind of coins (d) the number of coins
6. 6.⚙️ Which simple machine is a see-saw? (a) a pulley (b) a wheel and axle (c) an inclined plane (d) a lever
7. 7.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “the number of coins”? (a) we change it (b) we keep it the same (c) we measure it
8. 8.⚖️ Coins on the two sides balance when coins × distance is ___. (a) zero (b) bigger on the left (c) equal on both sides (d) always 10
9. 9.True or false: a magnet is not needed for the ruler lever. (a) False (b) True
10. 10.🔮 Predict: you move the pencil (fulcrum) nearer the coins you want to lift. Lifting gets ___. (a) harder (b) easier (c) impossible (d) the same
11. 11.True or false: a flagpole is an inclined plane. (a) False (b) True
12. 12.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “where the pencil is”? (a) we change it (b) we measure it (c) we keep it the same
13. 13.🧺 Which of these is not needed for the ruler lever? (a) a round pencil (b) a 30 cm ruler (c) coins of one kind (d) yeast
14. 14.🛟 Why should coins be kept away from very small children? (a) they are too cold (b) they are magnetic (c) they may swallow them (d) they are too shiny
15. 15.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is kept the same? (a) which side goes down (b) the same ruler (c) distance from the pencil
16. 16.True or false: a mirror is needed for the ruler lever. (a) True (b) False
17. 17.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? Which of these is what we measure? (a) distance from the pencil (b) the kind of coins (c) where the pencil is (d) which side goes down
18. 18.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) a round pencil (b) coins of one kind (c) a battery cell (d) a 30 cm ruler
19. 19.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 5 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?
20. 20.True or false: a battery cell is not needed for the ruler lever. (a) False (b) True
21. 21.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? What do we do with “which side goes down”? (a) we keep it the same (b) we measure it (c) we change it
22. 22.🧺 Which of these is needed for the ruler lever? (a) a balloon (b) turmeric powder (c) a battery cell (d) a 30 cm ruler
23. 23.🧺 Do we need turmeric powder for the ruler lever? (a) not needed (b) needed
24. 24.🛟 What is a safe way to use a ruler as a lever? (a) stand on the ruler (b) press it gently (c) bend it till it snaps (d) flick coins at faces
25. 25.🧺 Which of these is needed for the ruler lever? (a) a magnet (b) a balloon (c) a flat table (d) a battery cell
26. 26.True or false: a battery cell is needed for the ruler lever. (a) False (b) True
27. 27.⚙️ Which of these is an inclined plane? (a) a doorknob (b) a ramp (c) a bottle opener (d) a spoon lifting a lid
28. 28.True or false: a sloping road is an inclined plane. (a) True (b) False
29. 29.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: the same ruler is kept the same. (a) False (b) True
30. 30.⚖️ A ruler balances on a pencil at its middle. You place 6 coins 3 cm to the left of the pencil. How many coins must you place 6 cm to the right to balance it?
31. 31.⚙️ Which of these is a wheel and axle? (a) a well pulley (b) a spoon lifting a lid (c) a sloping road (d) a doorknob
32. 32.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: which side goes down is what we measure. (a) True (b) False
33. 33.🧺 Three of these are needed for the ruler lever. Which one is NOT needed? (a) coins of one kind (b) a 30 cm ruler (c) a mirror (d) a flat table
34. 34.🧺 Which of these is not needed for the ruler lever? (a) a battery cell (b) a 30 cm ruler (c) a flat table (d) a round pencil
35. 35.⚖️ Why is it easier to open a tin lid with the handle of a spoon? (a) the lid gets softer (b) the spoon is hot (c) a lever boosts your push (d) the spoon is magnetic
36. 36.⚖️ Fair test — does moving the coins farther from the pencil make that side go down more? True or false: distance from the pencil is the one thing we change. (a) False (b) True
37. 37.⚙️ Which of these uses a pulley? (a) a crane (b) a see-saw (c) a tap handle (d) a doorknob
38. 38.⚖️ A ruler balances on a pencil at its middle. You place 1 coin 12 cm to the left of the pencil and 6 coins on the right. How many cm from the pencil must the right-hand coins go to balance it?
39. 39.True or false: a magnet is needed for the ruler lever. (a) False (b) True
40. 40.⚖️ A ruler balances on a pencil at its middle. You place 2 coins 6 cm to the left of the pencil. How many coins must you place 2 cm to the right to balance it?

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